今天用瑞星杀毒时，特别慢！
有个叫mdm.exe 的程序占cpu 99%,此进程是点击“杀毒”以后产生的。
强制终止此进程，杀毒就正常了
后全盘查杀，没有发现病毒！
不知是何原因

HijackThis_815汉化版扫描日志 V1.99.1
保存于      17:05:56, 日期 2006-12-1
操作系统：  Windows XP SP2 (WinNT 5.01.2600)
浏览器：    Internet Explorer v6.00 SP2 (6.00.2900.2180)

当前运行的进程：         
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Rising\Rav\CCenter.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Rising\Rav\Ravmond.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\system32\spoolsv.exe
C:\Program Files\Rising\Rav\RavStub.exe
c:\ltdrv\srvany.exe
C:\WINDOWS\system32\VTTimer.exe
C:\WINDOWS\system32\VTtrayp.exe
C:\Ltdrv\Show_B.exe
C:\ltdrv\part559.exe
C:\WINDOWS\SOUNDMAN.EXE
C:\Program Files\Rising\Rav\RavTask.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Rising\Rav\Ravmon.exe
C:\WINDOWS\system32\svchost.exe
C:\Documents and Settings\Administrator\桌面\hijackthis1991zww\HijackThis1991zww.exe

O4 - 启动项HKLM\\Run: [IMJPMIG8.1] "C:\WINDOWS\IME\imjp8_1\IMJPMIG.EXE" /Spoil /RemAdvDef /Migration32
O4 - 启动项HKLM\\Run: [PHIME2002ASync] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /SYNC
O4 - 启动项HKLM\\Run: [PHIME2002A] C:\WINDOWS\system32\IME\TINTLGNT\TINTSETP.EXE /IMEName
O4 - 启动项HKLM\\Run: [VTTimer] VTTimer.exe
O4 - 启动项HKLM\\Run: [VTTrayp] VTtrayp.exe
O4 - 启动项HKLM\\Run: [Show_B] C:\Ltdrv\Show_B.exe
O4 - 启动项HKLM\\Run: [part559] c:\ltdrv\part559.exe ltrun
O4 - 启动项HKLM\\Run: [SoundMan] SOUNDMAN.EXE
O4 - 启动项HKLM\\Run: [IMSCMig] C:\PROGRA~1\COMMON~1\MICROS~1\IME\IMSC40A\IMSCMIG.EXE /Preload
O4 - 启动项HKLM\\Run: [RavTask] "C:\Program Files\Rising\Rav\RavTask.exe" -system
O4 - 启动项HKLM\\RunOnce: [RavStub] "C:\Program Files\Rising\Rav\ravstub.exe" /RUNONCE
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe

O8 - IE右键菜单中的新增项目: 导出到 Microsoft Office Excel(&X) - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - 浏览器额外的按钮: 联想 - {6096E38F-5AC1-4391-8EC4-75DFA92FB32F} - http://www.lenovo.com (file missing)
O9 - 浏览器额外的按钮: 信息检索 - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - 浏览器额外的按钮: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - 浏览器额外的“工具”菜单项: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O14 - IERESET.INF: START_PAGE_URL=http://www.lenovo.com
O16 - DPF: {6414512B-B978-451D-A0D8-FCFDF33E833C} (WUWebControl Class) - http://update.microsoft.com/windowsupdate/v6/V5Controls/en/x86/client/wuweb_site.cab?1149731290031
O17 - HKLM\System\CCS\Services\Tcpip\..\{3CE4BA1D-341A-407E-BAFC-7BC15FB14ED3}: NameServer = 218.76.192.100
O17 - HKLM\System\CS1\Services\Tcpip\..\{3CE4BA1D-341A-407E-BAFC-7BC15FB14ED3}: NameServer = 218.76.192.100
O23 - NT 服务: ltdrv - Unknown owner - c:\ltdrv\srvany.exe
O23 - NT 服务: Rising Process Communication Center (RsCCenter) - Beijing Rising Technology Co., Ltd. - C:\Program Files\Rising\Rav\CCenter.exe
O23 - NT 服务: Rising RealTime Monitor (RsRavMon) - Beijing Rising Technology Co., Ltd. - C:\Program Files\Rising\Rav\Ravmond.exe

C:\Ltdrv\Show_B.exe
C:\ltdrv\part559.exe
是联想保护卡系统

请帮忙分析一下，谢谢了